Need Help Understanding My $8,521 Refund Delay with Mysterious "Amended Return" on My IRS Transcript

I filed my taxes as Head of Household with 3 exemptions back in February, and I'm still waiting on my refund. My transcript shows a balance of -$9,521.00 as of Dec. 10, 2024, but I'm confused about what's happening with my return. Here's what my transcript shows: ACCOUNT BALANCE: -$9,521.00 ACCRUED INTEREST: $0.00 AS OF: Dec. 10, 2024 ACCRUED PENALTY: $0.00 AS OF: Dec. 10, 2024 ACCOUNT BALANCE PLUS ACCRUALS (this is not a payoff amount): -$9,521.00 INFORMATION FROM THE RETURN OR AS ADJUSTED EXEMPTIONS: 03 FILING STATUS: Head of Household ADJUSTED GROSS INCOME: $17,170.00 TAXABLE INCOME: $0.00 TAX PER RETURN: $0.00 SE TAXABLE INCOME TAXPAYER: $0.00 SE TAXABLE INCOME SPOUSE: $0.00 TOTAL SELF EMPLOYMENT TAX: $0.00 RETURN DUE DATE OR RETURN RECEIVED DATE (WHICHEVER IS LATER) Apr. 15, 2024 PROCESSING DATE Apr. 01, 2024 TRANSACTIONS CODE EXPLANATION OF TRANSACTION CYCLE DATE AMOUNT 150 Tax return filed 20241105 04-01-2024 $0.00 76211-419-38537-4 766 Credit to your account 04-15-2024 -$3,051.00 768 Earned income credit 04-16-2024 -$7,470.00 570 Additional account action pending 04-01-2024 $0.00 971 Amended tax return or claim 10-01-2024 $0.00 forwarded for processing 977 Amended return filed 10-01-2024 $0.00 43277-676-02854-4 571 Resolved additional account action 10-29-2024 $0.00 290 Additional tax assessed 20244705 12-09-2024 $0.00 33254-725-05573-4 I'm really confused about these codes. I see my return was processed on April 1st and I had credits posted to my account on April 15th and 16th including Earned Income Credit. But then there's a code 570 "Additional account action pending" from April 1st, and later in September/October there's stuff about an amended return being filed and processed (codes 971 and 977). I never filed an amended return that I know of! Then in late October there's code 571 "Resolved additional account action" and in December a code 290 "Additional tax assessed" for $0.00. Can someone help me understand what's going on? Why haven't I received my refund yet when it shows a balance of -$9,521.00? I really need this money and I'm getting nervous that something's wrong with my account. Are there red flags I should be worried about? Is the IRS holding my refund for some reason?